Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 83,433	$ 78,024
Accumulated amortization	39,669	35,238
Net	43,764	42,786
Client Contracts And Broker Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	68,098	62,689
Accumulated amortization	28,398	25,313
Net	39,700	37,376
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,240	2,240
Accumulated amortization	1,287	1,120
Net	953	1,120
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	9,946	9,946
Accumulated amortization	7,958	6,850
Net	1,988	3,096
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,012	2,012
Accumulated amortization	1,765	1,745
Net	247	267
Favorable Lease [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,137	1,137
Accumulated amortization	261	210
Net	$ 876	$ 927